Demax12 [1] filed a deletion request for ninvaders [2]: gcc -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -onInvaders globals.o view.o aliens.o ufo.o player.o nInvaders.o -lncurses /usr/bin/ld: ufo.o:(.bss+0x6d0): multiple definition of `aliens'; aliens.o:(.bss+0x6d0): first defined here /usr/bin/ld: ufo.o:(.bss+0x0): multiple definition of `skill_level'; aliens.o:(.bss+0x0): first defined here /usr/bin/ld: ufo.o:(.bss+0x4): multiple definition of `level'; aliens.o:(.bss+0x4): first defined here /usr/bin/ld: ufo.o:(.bss+0x8): multiple definition of `weite'; aliens.o:(.bss+0x8): first defined here /usr/bin/ld: ufo.o:(.bss+0x20): multiple definition of `bunker'; aliens.o:(.bss+0x20): first defined here /usr/bin/ld: ufo.o:(.bss+0x540): multiple definition of `alienBlock'; aliens.o:(.bss+0x540): first defined here /usr/bin/ld: ufo.o:(.bss+0x608): multiple definition of `alienshotnum'; aliens.o:(.bss+0x608): first defined here /usr/bin/ld: ufo.o:(.bss+0x620): multiple definition of `alienshoty'; aliens.o:(.bss+0x620): first defined here /usr/bin/ld: ufo.o:(.bss+0x660): multiple definition of `alienshotx'; aliens.o:(.bss+0x660): first defined here /usr/bin/ld: ufo.o:(.bss+0x6a0): multiple definition of `lowest_ship'; aliens.o:(.bss+0x6a0): first defined here /usr/bin/ld: ufo.o:(.bss+0x6c8): multiple definition of `shipnum'; aliens.o:(.bss+0x6c8): first defined here /usr/bin/ld: player.o:(.bss+0x6f0): multiple definition of `aliens'; aliens.o:(.bss+0x6d0): first defined here /usr/bin/ld: player.o:(.bss+0x18): multiple definition of `skill_level'; aliens.o:(.bss+0x0): first defined here /usr/bin/ld: player.o:(.bss+0x6e8): multiple definition of `shipnum'; aliens.o:(.bss+0x6c8): first defined here /usr/bin/ld: player.o:(.bss+0x1c): multiple definition of `level'; aliens.o:(.bss+0x4): first defined here /usr/bin/ld: player.o:(.bss+0x20): multiple definition of `weite'; aliens.o:(.bss+0x8): first defined here /usr/bin/ld: player.o:(.bss+0x28): multiple definition of `ufo'; ufo.o:(.bss+0x6e8): first defined here /usr/bin/ld: player.o:(.bss+0x40): multiple definition of `bunker'; aliens.o:(.bss+0x20): first defined here /usr/bin/ld: player.o:(.bss+0x560): multiple definition of `alienBlock'; aliens.o:(.bss+0x540): first defined here /usr/bin/ld: player.o:(.bss+0x628): multiple definition of `alienshotnum'; aliens.o:(.bss+0x608): first defined here /usr/bin/ld: player.o:(.bss+0x640): multiple definition of `alienshoty'; aliens.o:(.bss+0x620): first defined here /usr/bin/ld: player.o:(.bss+0x680): multiple definition of `alienshotx'; aliens.o:(.bss+0x660): first defined here /usr/bin/ld: player.o:(.bss+0x6c0): multiple definition of `lowest_ship'; aliens.o:(.bss+0x6a0): first defined here /usr/bin/ld: nInvaders.o:(.bss+0x6f0): multiple definition of `weite'; aliens.o:(.bss+0x8): first defined here /usr/bin/ld: nInvaders.o:(.bss+0x6ec): multiple definition of `level'; aliens.o:(.bss+0x4): first defined here /usr/bin/ld: nInvaders.o:(.bss+0x6e8): multiple definition of `skill_level'; aliens.o:(.bss+0x0): first defined here /usr/bin/ld: nInvaders.o:(.bss+0x6c8): multiple definition of `shipnum'; aliens.o:(.bss+0x6c8): first defined here /usr/bin/ld: nInvaders.o:(.bss+0x18): multiple definition of `ufo'; ufo.o:(.bss+0x6e8): first defined here /usr/bin/ld: nInvaders.o:(.bss+0x20): multiple definition of `bunker'; aliens.o:(.bss+0x20): first defined here /usr/bin/ld: nInvaders.o:(.bss+0x540): multiple definition of `alienBlock'; aliens.o:(.bss+0x540): first defined here /usr/bin/ld: nInvaders.o:(.bss+0x608): multiple definition of `alienshotnum'; aliens.o:(.bss+0x608): first defined here /usr/bin/ld: nInvaders.o:(.bss+0x620): multiple definition of `alienshoty'; aliens.o:(.bss+0x620): first defined here /usr/bin/ld: nInvaders.o:(.bss+0x660): multiple definition of `alienshotx'; aliens.o:(.bss+0x660): first defined here /usr/bin/ld: nInvaders.o:(.bss+0x6a0): multiple definition of `lowest_ship'; aliens.o:(.bss+0x6a0): first defined here /usr/bin/ld: nInvaders.o:(.bss+0x6d0): multiple definition of `aliens'; aliens.o:(.bss+0x6d0): first defined here collect2: error: ld returned 1 exit status make: *** [Makefile:11: nInvaders] Error 1 Any ideas? [1] https://aur.archlinux.org/account/Demax12/ [2] https://aur.archlinux.org/pkgbase/ninvaders/